Tool-holder.



w. u. STBPHENSON. l .TOOL HOLDER. APPLICATION IILBDJAN. 29, 1914* 1,104,014., Patented July 21, 1914,

UNITED STATES PATENT OFFICE.

WILLIAM C. STEPHENSON, 0F ROCKY MOUNT, NORTH CAROLINA, ASSIGNOR 0F ONE- HALF T0 JOHN M. DAUGHTER-Y, 0I? ROCKY MOUNT, NORTH CAROLINA.

TOOL-HOLDER. 4

Specification of Letters Patent. Patented July 21, 1914, Applicationled January 29, 1914. Serial No. 815,142.

To all lwhom it may concern:

Be it known that I, WILLIAM C. STE- rHnNsoN, of Rocky Mount, in the county of Edgecombe and State of North Carolina, have invented a certain new and useful Improvement in Tool-Holders, ofwhlch provement the following is a specification.

Theobject of my invention -is to provide means whereby a material reduction in the size and cost of steel tools used for cutting metals may be effected, and such tools be protected from liability to breakage in service, by a holding appliance which is of simple and inexpensive construction and is vadapted to the requirements of lathes, planers,'boring mills, and other machine tools.

The improvement vclaimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a view, in perspectlve, of a tool holder illustrating an embodiment of my invention,

with a metal cutting tool in operative posltion therein; Fig. 2, aplan or top view of the same; Fig. 3, an end view, as seen from the left, the tool holder being indicated as held in a tool post; 'and Fig. 4, a similar view, as seen from the right.

In the practice of my invention, I provide a tool holder, 1, which is composed of metal of proper strength to withstand the strain imposed upon it by the bearing of a cutting tool upon a ieee of Work, as, say, carbon steel, and whichis in theform of a block of preferably rectangular transverse Fsection, and of slightly shorter length than.

the tool which it is designed to carry. A longitudinal recess, l", is formed in the top of the tool holder 1, said recess being of such width as to permit a metal cutting tool, 2, to t'truly within it, and being slightly less in depth than the thickness of the tool,

which, in the instance shown, is round nosed,

and is ordinarily made 0f high Speed7 alloy steel. A bottomvsupport, 1", is formed on one end of the tool holder, its face being flush with thebottom ofthe recess, 1,.and

` extends outwardly from the body thereof for a sufficient distance to reach to or near the point of the tool, and a back support, 1c, which abuts against the back of the tool, is formed on the top and at one side of the bottom support, and constitutes an extension the inner end of said support, so as to leave a front clearance space for the holderv and tool, and an inclined face, 1d, is formed on the top of the back support, which coperates with a correspondingly ground face on the top of the tool to provide clearance for the escape of shavings.

The tool holder is fixed` iny the tool post or other tool supporting member of alathe, boring mill, or other machine tool, in any suitable known manner, and is indicated in Fig. 3, as being held in a tool post, 4:, by a blnding screw. 5, which bears on the top of the tool, 2, and clamps it and the tool holder in operative position. The tool is held in vplace in the holder, when removed from the smaller tool maybe used than in the case of those that are supported in tool holders of the forms ordinarily heretofore used.

I claim as my invention a-nd desire to secure by Letters Patent:

1. A tool' holder having a longitudinal re- -cess in its top face of 4less depth than the thickness of the tool to be held, 'a projection, conforming in shape to the -contour' of the cutting end of the tool, on the 'front end of the holder, the top face Aof, said projection forming a continuation' of the bottom of said recess, and means to clamp thetool in the holder. h'

2. A tool holder having a longitudinal recess in its top face of less depth thanthe tool to be held, an integral projection on the front end of said holder, the top of which forms a continuation of the bottom of said recess and the front end of-said projection conforming in shape tothe contour of the nose of the tool, and a back support for the atool projecting from the front end of the A 5 recess in its body adapted to receive a. metal holder to one side of said recess, the top end of said reoess, and a back sufport exface of said back su port sloping downtending upwardly from the topo the bot- Wa-rdl toward the si e of the holder. tom support.

3. tool holder having a. longitudinal WILLIAM C. STEPHENSON. Witnesses: vcutting tool, a bottom support for the tool E. V. Krsna, v extending outwardly from the body, at, one J. M. GRIFHN. 

